The NCH 700, as these headphones finally sport USB-C instead of Micro-USB. Plus, these are rated for up to 20 hours of use on a full charge. This feature is quite impressive. Besides that the 15-minute charge will power the NCH 700 for up to an additional two hours. Bose also states that these headphones will fully charge in about 2.5 hours. After fully charged, the NCH 700 will last for up to 20 hours before you’ll need to plug them in again. But, why these headphones are the best, for reasons click the video.